In order to win the Grand Slam in Tennis, a player must win which one of the followings groups of tournaments?
(a) Australian Open, Wimbledon, French Open, U.S. Open
(b) Wimbledon, French Open, U.S. Open
(c) Wimbledon, French Open, Paegas Czech Open, U.S. Open
(d) Davis Cup, Wimbledon, French Open